Mertz



v UNITED STATES PATENT OFFICE.A

`:VICTOR DE SPRUNERMERTZ, on BRUssELs'BELGIUM.

GLOBE FoR INCANoEscEN-r LAMPS,

srEcrrIoarIoN forming part ef Letters Patent ivo. 605,026, dated May e1, 1299s.V Application'led November 18,18l'l.v Serial No. 658,916. (No model.) Patented in Germany July-30, 1896, No. 92,154.

To all whom it may concern: i

Be it known that I, .Vieron DE'SPRUNER- MERTZ, a citizen of the Kingdom of Belgium,re siding at Brussels, Belgium, have invented certain new and useful Improvements in Globes for Incandescent Lamps, (patented in Germany, No. 92,154, .Tuly '30, 1896,)A of which the following is a specification.

This invention relates to an improvement in globes of incandescentlamps, and has for i s object to p rovide for a more complete reiectionof light in' the usualincandescentlamp globes employing a carbon iilm contained in vacuum.

' The invention therefore consists in a globe of double conical shape in longitudinal crosssection, the rear'portion of .the globe having a semicircular bulge adjacent to the reduced portion ofthe rear conical portion, the front conical surface and bulged portions `being transparent, and the rear conical surface being opaque and coated with a reflecting ina- Ilerial, whereby the light-rays from the iilm are reiiected both forwardly and rearwardly.

The invention f-urther consistsin the parts shown in the drawings, described in the speciiication, and more particularly pointed out in i the claims'. f

In the drawings, Figure 1 is a side elevation of a globe embodying thev novel features ofmy invention. Fig. 2 is a longitudinal vertical sectional view of the same, and Fig. 3 is anend view of the lamp. l

' In carrying out my invention the lamp is formed with a conical-shaped front portion' A,

-. the base ofthe portion A terminating in a curved line, as at d, from which point a like base of theconical-shaped portion B commences, the said portion B being inthe form of a truncated cone, the contracted end e ter.- minating` in an annular-semicircnlar bulged portion C, contractedin rear thereof in conical form at C', the. rear end of the lamp terminatingin an'annnlarextension D. .Within the annular extension D is secured the base E of thew lamp, which -is provided with pins E uponk diametrically opposite s ides of the same by which to attach the lamp to the Wall or ceiling fixture in the usual orina-ny preferred manner..

The conical portion B of the globe is faced with are'iiecting-surface, such as quicksilver,

the reiiecting-coatin g extending forward toa point or at the forward limit of the curved connection dbetween the conical portions A and B 'of the globe. p

adesignates the usual carbon iilm connected, with thecontact-points a a2 in the usual or in anyvpreferred manner. f

In the operation of the lamp the light-rays from the film are'radiated against the reflecting-surface upon the portion B of the globe,

and are consequently reflected forwardly in l lainp-globe which provides for a perfect radiation of light-rays in a direction in front of the v globe and a like radiationl in rear thereof,

whereby the roomin which tliela'inp is placed is lighted infevery part.

What I-claim is- 1. AA lamp-globe formed of transparent material'and consisting of a double conicaLportion truncated at one end, a narrow conical portion, and an intermediate annular portion integrally connectingthe two first-named por tions, the said conical portion and the adjacent member of the double conical portion 'being lined with refiecting material, and the source of light being adapted jLo-be situated between the annular portion and the extreme end or tip of the globe, substantially as dcscribed.

2. A lamp-globe formed of transparent material and consisting of a double conical portionI truncated at one end, a narrow conical portion, and an intermediate bulging and annular portion integrally. connecting the two iirs'tlnamed portions, the Walls of the truncated member of the double conical portion and the conical portion being lined with refleeting material and being substantially parallel and the source of light being adapted to be situated between the annular portion and IOO the extreme end or tip ot the globe, substantially as described.

I). A globe for incandescent electric lamps formed of transparent material and consisting of a double conical portion truncated at one end and having the meeting ends of its members joined in a curved surface, a narrow conical portion, and an intermediate bulging and annular portion integrally connecting the two inst-named portions, the wall of the double conical portion being lined with rellecting material from its truncated end to and somewhat beyond the line ot' junction of the members of said portion, the wall of the conical portion being likewise lined with reflecting material and arranged substantially parallcl to the wall of the truncated member of. .said double conical portion, and the son rce of liglt being adapted to be situated between the annular portion and the extreme or tip end of the globe, substantially as described.

t. A globe for incandescent electric lamps formed ot' transparent material and consisting of a double conical portion truncated at one end and having the meeting ends of its members joined in a curved surface, a bulging portion adjoining said truncated end of the double conical portion, a narrow conical portion, and an annular portion, all integrally connected together in the order named, the wall of the double conical portion beinglined with reflecting material from its truncated end to and somewhat beyond the line of junction of the members of Said portion, the wall ofthe conical portion being also lined with retleeting material and arranged parallel to the wall of the truncated member of said double conical portion, and the source of light being adapted to be situated approximately in the plane of the line of junction of Said members ot' the double conical portion, substantially as described.

In testimony that I claim the foregoing as my invention I have signed my name in the presence ol` two subscribing witnesses.

VICTOR DE SlRl'NER-MERTZ.

Witnesses: 

